My son has never liked traditional toys, he only likes toys that allow him to build something - so this was right up his alley! He can complete each build using the booklet without much help, I was worried it would be too complicated to build on his own since he's a little young. His grandfather is an aerospace engineer and they've bonded over these little engineered toys - which is such a delightful bonus! We found the toys first but the videos with the engineer guy showing you everything and the You Tube shows are such a great find - my son is now quoting him "that's not a failure, it's a clue", which honestly is my favorite part - something you'd never get from just buying a regular toy. Very happy we got this subscription, every time it arrives the whole family gets excited!